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Experiments on wedge-shaped deep sea sedimentary deposits in minibasins and/or on channel levees emplaced by turbidity currents; Part I, Documentation of the flow

Octavio E. Sequeiros, Benoit Spinewine, Marcelo H. Garcia, Rick T. Beaubouef, Tao Sun and Gary Parker
Experiments on wedge-shaped deep sea sedimentary deposits in minibasins and/or on channel levees emplaced by turbidity currents; Part I, Documentation of the flow
Journal of Sedimentary Research (August 2009) 79 (8): 593-607

Abstract

Decelerating turbidity currents commonly emplace sedimentary wedges. Here "sedimentary wedge" is used as a generic term for a sediment deposit, the thickness of which gradually decreases in the downdip direction. Examples of sedimentary wedges relevant to the research reported here include a) deposits in submarine minibasins, b) deposits on zones of lower slopes of stepped profiles, and c) deposits on the levees of submarine channels. In the present work, a generic configuration is used to study the flows that emplace sedimentary wedges. These flows consisted of a succession of sustained saline density underflows, which were used as surrogates for turbidity currents driven by fine-grained material (mud) that does not easily settle out. Although the flow naturally decelerated in the downstream direction, deceleration was ensured by the presence of a barrier to the flow at the downstream end of the study reach. The density underflows carried a load of lightweight plastic particles, from which the depositional wedge was constructed. The experiments were not designed to model any specific field configuration. This notwithstanding, the experimental configuration provides an analog for a) decelerating flows into confined minibasins, as well as b) levee-constructing overflows from submarine channels. This paper documents the nature of the flows that emplaced the wedge. The sedimentary wedge itself is documented in a companion paper.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 79
Serial Issue: 8
Title: Experiments on wedge-shaped deep sea sedimentary deposits in minibasins and/or on channel levees emplaced by turbidity currents; Part I, Documentation of the flow
Affiliation: University of Illinois, Department of Civil and Environmental Engineering, Urbana, IL, United States
Pages: 593-607
Published: 200908
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 44
Accession Number: 2009-086737
Categories: Oceanography
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, 6 plates
Secondary Affiliation: ExxonMobil Exploration, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 200947
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